LOS ANGELES--(BUSINESS WIRE)--The first study to demonstrate that obesity can directly accelerate the progression of acute lymphoblastic leukemia (ALL) has been conducted at The Saban Research Institute of Childrens Hospital Los Angeles and was published in Cancer Prevention Research, on October 5, 2010. Obesity has been associated with an increased incidence of many cancers, including leukemia, but it has been unknown whether the increase in incidence was a direct effect of obesity or associated with genetic, lifestyle, health, or socio-economic factors.